Feel dumb, but having coded for 10+ years, haven’t used a do-while loop in the last 9. For the life of me, I cannot figure out why this is returning 1 instead of

 const getNextEventCountTest = () => {

        
        let sum = 0;
        let q = 0;

        do {
            sum = sum + 0.5
        }
        while (sum < 4){
         
            q = q + 1;
        }

        return q;
  };

do-while is a good here, since I want to always run the first code block but only conditionally increment q.

but this:

console.log(getNextEventCountTest()); => 1

feeling dumb but dunno lol.

whereas this has the right behavior:

const getNextEventCountTest = () => {
  
        let sum = 0;
        let q = 0;

        // this is desired behavior:
        while (sum < 4){
            sum = sum + 0.5
            if(sum < 4){
               q = q + 1;
            }
        }

        return q;
  };

>Solution :

This is because your code executes like do { ... } while(condition); { ... }. Notice the added semicolon – the second {} block executes once.